On 21/09/2018 13.48, James Knott wrote:
On 09/21/2018 01:38 PM, Per Jessen wrote:
Google (gmail) I suspect does not allow talking on :25 without encryption, or the email can be easily read on transit. No, Google does not require TLS.
Actually, it does. I just tried setting my smtp server to port 25 & no security. I got this error message:
An error occurred while sending mail. The mail server responded: 5.7.0 Must issue a STARTTLS command first. i26-v6sm9327158ioj.33 - gsmtp. Please verify that your email address is correct in your account settings and try again.
So, it would appear STARTTLS is mandatory, so that encryption can be used. I also seem to recall Google saying SSL/TLS would be required to connect to their servers. They are heavily promoting encryption in general, even preferring https sites to http in web searches.
Yep :-) -- Cheers / Saludos, Carlos E. R. (from openSUSE 15.0 (Legolas))